problem
-------
Enabling and disabling 'LICENSE_CREATE_PACKAGE' doesn't cause rerun of the packaging process. As a result, if this variable is first enabled when building an image, and is then disabled when rebuilding the image, the license packages (e.g. busybox-lic) are still installed into that image. This is obviously not desired.

To reproduce, use the following steps:
1. set in local.conf:
LICENSE_CREATE_PACKAGE = "1"
COPY_LIC_MANIFEST = "1"
COPY_LIC_DIRS = "1"
2. bitbake busybox
3. set in local.conf:
# LICENSE_CREATE_PACKAGE = "1"
# COPY_LIC_MANIFEST = "1"
# COPY_LIC_DIRS = "1"
4. bitbake busybox

Use the following command to verify that the license package is still required by the main busybox pacakge.
rpm -qp --requires <path/to/busybox/rpm/package> | grep '\-lic'


cause
-----
The license copying process should be in do_install task instead of the do_package task. This is because that copying of license has effect on ${D} instead of ${PKGD}.

//Chen Qi